Optimization model of overlap rate of laser cladding based on Gaussian function and top tangent model

Abstract

As an important characterization of surface quality, the surface morphology of laser cladding coating directly affects the choice and difficulty of subsequent processing technology. The laser cladding coating is made of multi-track cladding layers, and the variation and optimization of overlap rate directly affect the quality of surface morphology. Firstly, the height, width and wetting angle of single-track cladding layer are substituted into the Gaussian function to obtain the characterization curve of single-track cladding layer, which can accurately characterize the profile curve of the single-track cladding layer. Then, by analyzing dual-track overlapping experiments with the variation overlap rates, it was found that the contour of the filled area is approximately a quadratic function curve. The area ratio of the filled area to the overlapping area first decreases and then increases with the increase of the overlap rate, reaching about 0.5 near the optimal overlap rate. Finally, a top-tangent overlapping model is developed based on the single-track characterization model of the Gaussian function and the forming characteristics of multi-track cladding layers. Experimental results show that the model can well characterize the multi-track cladding layers, and it is of great significance for optimizing the overlap rate of laser cladding and obtaining high-quality cladding layers.